Radiant heater



FIG. 1.1 is a top plan view of a radiant heater, showing the first embodiment of our new design;

FIG. 1.2 is a top side perspective view thereof;

FIG. 1.3 is a top perspective view thereof; and

FIG. 1.4 is a right end top perspective view thereof;

FIG. 2.1 is a top plan view of a radiant heater, showing the second embodiment of our new design;

FIG. 2.2 is a top side perspective view thereof;

FIG. 2.3 is a top perspective view thereof; and

FIG. 2.4 is a right end top perspective view thereof; 

CLAIM The ornamental design for a radiant heater, as shown and described. 